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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
async_test(t => {
let start_length = history.length;
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
window.onload = () => t.step_timeout(() => {
navigation.navigate("#top");
assert_equals(navigation.entries().length, 2);
let i = document.createElement("iframe");
i.src = "/common/blank.html";
document.body.appendChild(i);
i.onload = () => t.step_timeout(() => {
assert_equals(i.contentWindow.navigation.entries().length, 1);
i.contentWindow.navigation.navigate("#fragment");
assert_equals(i.contentWindow.navigation.entries().length, 2);
i.contentWindow.navigation.back().committed.then(t.step_func(() => {
assert_equals(i.contentWindow.navigation.entries().length, 2);
assert_equals(i.contentWindow.navigation.currentEntry.index, 0);
return i.contentWindow.navigation.forward().committed;
})).then(t.step_func_done(() => {
assert_equals(i.contentWindow.navigation.entries().length, 2);
assert_equals(i.contentWindow.navigation.currentEntry.index, 1);
}));
}, 0);
}, 0);
}, "navigation.traverseTo() should work in an iframe that is not present in all history entries");
</script>
</body>
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